Issue #13013: ctypes: Fix a reference leak in PyCArrayType_from_ctype.

Thanks to Suman Saha for finding the bug and providing a patch.

Misc/ACKS

@@ -828,6 +828,7 @@ Mark Russell
 Nick Russo
 Patrick Sabin
 Sébastien Sablé
+Suman Saha
 Hajime Saitou
 George Sakkis
 Rich Salz

Misc/NEWS

@@ -1295,6 +1295,9 @@ Tools/Demos
 Extension Modules
 -----------------
 
+- Issue #13013: ctypes: Fix a reference leak in PyCArrayType_from_ctype.
+  Thanks to Suman Saha for finding the bug and providing a patch.
+
 - Issue #13022: Fix: _multiprocessing.recvfd() doesn't check that
   file descriptor was actually received.
 

Modules/_ctypes/_ctypes.c

@@ -4474,6 +4474,7 @@ PyCArrayType_from_ctype(PyObject *itemtype, Py_ssize_t length)
     if (!PyType_Check(itemtype)) {
         PyErr_SetString(PyExc_TypeError,
                         "Expected a type object");
+        Py_DECREF(key);
         return NULL;
     }
 #ifdef MS_WIN64